cc/resources/content_layer_updater.h

// Copyright 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CC_RESOURCES_CONTENT_LAYER_UPDATER_H_
#define CC_RESOURCES_CONTENT_LAYER_UPDATER_H_

#include "cc/base/cc_export.h"
#include "cc/resources/layer_updater.h"
#include "ui/gfx/rect.h"

class SkCanvas;

namespace cc {

class LayerPainter;
class RenderingStatsInstrumentation;

// Base class for BitmapContentLayerUpdater and
// SkPictureContentLayerUpdater that reduces code duplication between
// their respective PaintContents implementations.
class CC_EXPORT ContentLayerUpdater : public LayerUpdater {
 public:
  void set_rendering_stats_instrumentation(RenderingStatsInstrumentation* rsi);
  virtual void SetOpaque(bool) OVERRIDE;

 protected:
  ContentLayerUpdater(scoped_ptr<LayerPainter> painter,
                      RenderingStatsInstrumentation* stats_instrumentation,
                      int layer_id);
  virtual ~ContentLayerUpdater();

  void PaintContents(SkCanvas* canvas,
                     gfx::Point origin,
                     float contents_width_scale,
                     float contents_height_scale,
                     gfx::Rect* resulting_opaque_rect);
  gfx::Rect content_rect() const { return content_rect_; }

  bool layer_is_opaque() const { return layer_is_opaque_; }

  RenderingStatsInstrumentation* rendering_stats_instrumentation_;
  int layer_id_;

 private:
  gfx::Rect content_rect_;
  scoped_ptr<LayerPainter> painter_;

 protected:
  // True when it is known that all output pixels will be opaque.
  bool layer_is_opaque_;

  DISALLOW_COPY_AND_ASSIGN(ContentLayerUpdater);
};

}  // namespace cc

#endif  // CC_RESOURCES_CONTENT_LAYER_UPDATER_H_